Slant shear bond strength between self compacting concrete and old concrete

Diab, Ahmed M.; Elmoaty, Abd Elmoaty M. Abd; Eldin, Mohamed R. Tag

doi:10.1016/j.conbuildmat.2016.11.023

Cited by 115 publications

(36 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Shear test results are depicted in Figure 11. The results indicate that the increase in the overlay concrete strength also improved the bond strength of concretes, similar results are reported by other researchers [3], [5], [10], [18]. Although SF incorporation was dramatically increased the bond strength calculated from in bi-surface shear test, the same performance of SF was not notable when the slant shear test results were considered.…”

Section: Shear Testsupporting

confidence: 89%

Mechanical properties of concrete to concrete interfaces under uniaxial and shear forces

Kabay¹,

Kizilkanat²

2018

Pamukkale J Eng Sci

View full text Add to dashboard Cite

ÖzThis research aims to evaluate the bond strength between normal strength substrate concrete and different types of high strength overlay concretes. In order to obtain different characteristics in the overlay concrete, silica fume and steel fibers were used. The slant shear and bisurface shear tests were conducted to quantify the effect of different high strength concrete compositions on the bond strength. The mechanical properties of overlay/substrate concrete composites were also analysed on cylindrical samples under uniaxial compression load.The results indicate that the strength of overlay plays an important role on the bond mechanism. The bond strength is found to be dependent on the test mechanism. The test results showed that the bond strength was about 6-12 times higher in slant shear test compared to the bi-surface shear test. The application of parallel model approach on the overlay/substrate concrete composites was found to be quite satisfactory to predict the elastic modulus of the composite. Bu deneysel çalışmada eski betonu temsilen normal dayanımlı beton ile yeni betonu temsil eden farklı tipteki yüksek dayanımlı betonlar arasındaki aderans dayanımının incelenmesi amaçlanmıştır. Farklı karakteristiğe sahip yeni beton elde etmek amacı ile silis dumanı ve çelik lif kullanılmıştır. Farklı kompozisyonlara sahip yüksek dayanımlı betonun aderans dayanımına etkisi eğik kayma (slant shear) ve çiftyüzey kayma (bi-surface shear) deneyleri ile belirlenmiştir. Ayrıca eski/yeni beton kompozitlerin eksenel basınç yükü etkisi altındaki mekanik özellikleri deneysel olarak belirlenmiştir. Elde edilen sonuçlara göre yeni beton dayanımının ve kayma deneyinde kullanılan yöntemin aderans dayanımı üzerinde önemli bir etkisi olduğu görülmüştür. Eğik kayma deneyinin çift yüzey kayma deneyine göre 6-12 kat yüksek aderans dayanımı verdiği tespit edilmiştir. Paralel model yaklaşımının eski/yeni beton kompozitlerin elastisite modülünün tahmininde tatminkar sonuçlar verdiği belirlenmiştir.

show abstract

Section: Shear Testsupporting

confidence: 89%

Mechanical properties of concrete to concrete interfaces under uniaxial and shear forces

Kabay¹,

Kizilkanat²

2018

Pamukkale J Eng Sci

View full text Add to dashboard Cite

show abstract

“…The results showed that the coarse aggregate used in this study complies with the standard (IQS No. 45/1984) limits Size (5)(6)(7)(8)(9)(10)(11)(12)(13)(14). Gravel must be washed to remove clay and salts and then stored in containers in a Saturated Surface Dry (SSD) condition before use it.…”

Section: Coarse Aggregatementioning

confidence: 99%

“… After 28 days and before the repair material is placed on the substrate concrete, the slant surfaces of the substrate concrete specimen and the wide mouthed notch roughing by making horizontal and vertical groves with 3mm depth as stated by the study prepared by Diab et al (2017) [11]. Then, casted by repair material and after 24 hrs.…”

Section: Admixture Type Of "High Range Water Reducing (Hrwr)"mentioning

confidence: 99%

Reactive Powder Concrete with Steel, Glass and Polypropylene Fibers as a Repair Material

2019

View full text Add to dashboard Cite

Repairing of reinforced concrete structures is currently a major challenge in the construction industry and is being put back into operation with a slight loss in load carrying capacity. Damage occurs due to many factors that reduce the strength of concrete structures and their durability. The aim of this paper is study the compatibility between three types of reactive powder concrete with (steel fibre, glass fibre and polypropylene fibre) as a repair materials and normal strength concrete as a substrate concrete. Compatibility was investigated in three steps. First: individual properties for substrate concrete were studied, these are (slump test, compressive strength, splitting strength, and flexural strength) also, for repair material these are (compressive strength and flexural strength) were determined by using standard ASTM test methods. Second: bond strength of composite cylinder for substrate concrete with different repair materials were evaluated by using slant shear test. Third: compatibility was investigated by using composite prisms of substrate concrete with different repair materials under two-point loading (flexural strength test). From the experimental results concluded, bond strength between reactive powder concrete with glass fibre as a repair material and normal strength concrete as a substrate layer is higher (17.38Mpa) compared with RPC with steel fibre (13.13Mpa) and polypropylene fibre (14.31MPa). Also, it is more compatible due to flexural strength for composite prisms (having higher flexural strength (8.13MPa). Compared with steel fibre (7.44MPa) and polypropylene fibre (6.47MPa). These results due to RPC with glass fibre have good workability with suitable flowability and glass fibre have higher tensile strength compare with other fibre.

show abstract

“…The bond strength can be affected by many factors, such as the roughness of the substrate concrete [5][6][7][8][9], the agent of the interface [10], the compressive strength of new concrete [11], the effect of the reinforcement [12], etc. The use of polypropylene fiber also effects the shear bond strength between self-compacting concrete and old concrete [13]. Different pretreatments on the surface of the old concrete can affect the bond strength significantly [14]; the effect of concrete substrate surface preparation can be characterized by roughness and micro-cracking in the near-to-surface layer [15].…”

Section: Introductionmentioning

confidence: 99%

Effects of Cyclic Freeze–Thaw on the Steel Bar Reinforced New-To-Old Concrete Interface

Luo

Zhang

et al. 2020

Molecules

View full text Add to dashboard Cite

Frost damage of concrete has significant effects on the safety and durability of concrete structures in cold regions, and the concrete structures after repair and reinforcement are still threatened by cyclic freezing and thawing. In this study, the new-to-old concrete interface was reinforced by steel bar. The shear strength of the new-to-old concrete interface was tested after the new-to-old combination was subjected to cyclic freeze–thaw. The effects of the diameter of the steel bar, the compressive strength of new concrete, the number of freeze–thaw cycles and the freezing temperatures on the shear properties of new-to-old concrete interface were studied. The results showed that, in a certain range, the shear strength of the interface was proportional to the diameter of the steel bar and the strength of the new concrete. Meanwhile, the shear strength of the reinforced interface decreased with the decreasing of the freezing temperature and the increasing of the number of freeze–thaw cycles.

show abstract

Slant shear bond strength between self compacting concrete and old concrete

Cited by 115 publications

References 9 publications

Mechanical properties of concrete to concrete interfaces under uniaxial and shear forces

Mechanical properties of concrete to concrete interfaces under uniaxial and shear forces

Reactive Powder Concrete with Steel, Glass and Polypropylene Fibers as a Repair Material

Effects of Cyclic Freeze–Thaw on the Steel Bar Reinforced New-To-Old Concrete Interface

Contact Info

Product

Resources

About